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Oil displacement additive for enhancing intersolubility of CO2 with crude oil and reducing viscosity of crude oil

An oil-soluble viscosity reducer and additive technology, applied in the field of oil displacement additives, can solve the problems of decreased displacement efficiency, unreachable, and high MMP, and achieve the effects of reducing viscosity, good injectability, and enhancing fluidity

Active Publication Date: 2018-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most reservoirs, especially heavy oil reservoirs with high viscosity and many heavy components, their MMP is generally high, which often cannot meet the conditions for miscible flooding. 2 Displacement efficiency will drop

Method used

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  • Oil displacement additive for enhancing intersolubility of CO2 with crude oil and reducing viscosity of crude oil
  • Oil displacement additive for enhancing intersolubility of CO2 with crude oil and reducing viscosity of crude oil
  • Oil displacement additive for enhancing intersolubility of CO2 with crude oil and reducing viscosity of crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Preparation of oil displacement additive and determination of its viscosity-reducing performance on crude oil

[0020] The oil displacement additive is composed of a solubilizer propyl toluate and a viscosity reducer stearyl acrylate-vinyl acetate-acrylamide copolymer, and the weight ratio of the solubilizer to the viscosity reducer is 4:1. Add the solubilizer and the viscosity reducer into the beaker, stir at room temperature for more than 1 hour to mix well, and let stand to obtain the oil displacement additive.

[0021] The preparation method of the stearyl acrylate-vinyl acetate-acrylamide copolymer is as follows: in a 150ml three-necked flask equipped with a condenser, a thermometer and a mechanical stirring device, add 80ml of toluene as a reaction solvent, and then add a total amount of 10g , octadecyl acrylate, vinyl acetate and acrylamide in a molar ratio of 2:3:5, and the initiator azobisisobutyronitrile of 5% of the total weight of raw materials, th...

Embodiment 2

[0028] Embodiment 2 tests oil displacement additive to promote CO 2 Solubility in heavy oil

[0029] The oil displacement additive used is consistent with Example 1. The airtightness of the instrument needs to be checked before the experiment, and CO is introduced into the autoclave 2 , kept at 25MPa for 2h, if the pressure fluctuation does not exceed 1%, it can be considered that the airtightness is good. During the experiment, first weigh 25 g of heavy oil in the balance kettle, turn on the CO 2 Injection valve and gas phase sampling valve, with 100 ~ 200ml / min of CO 2 Air purging for 10 minutes, the air in the kettle was exhausted, and then all valves were closed. Turn on the constant temperature water bath, raise the pressure to 15MPa, stir and balance to make it reach gas-liquid equilibrium more than 1h. Afterwards, slightly open the liquid phase sampling valve, take out about 20 mg of liquid phase sample, and measure the amount of released gas. During the process, t...

Embodiment 3

[0030] Embodiment 3 prepares oil displacement additive and measures its performance

[0031] The oil displacement additive is composed of a solubilizer propyl toluate and a viscosity reducer lauryl acrylate-vinyl acetate-acrylamide copolymer, and the weight ratio of the solubilizer to the viscosity reducer is 4:1. Add the solubilizer and the viscosity reducer into the beaker, stir at room temperature for more than 1 hour to mix well, and let stand to obtain the oil displacement additive.

[0032] The preparation method of described lauryl acrylate-vinyl acetate-acrylamide copolymer is: in the 150ml three-necked flask that condenser, thermometer and mechanical stirring device are housed, add 80ml toluene as reaction solvent, then add total amount 10g , lauryl acrylate, vinyl acetate and acrylamide in a molar ratio of 2:3:5, and the initiator azobisisobutyronitrile of 5% of the total weight of raw materials, through N 2 After displacing the air in the reaction bottle, stir and ...

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Abstract

The invention discloses an oil displacement additive for enhancing the intersolubility of CO2 with crude oil and reducing the viscosity of the crude oil. The oil displacement additive consists of a solubilizer and an oil-soluble viscosity reducer, and the weight ratio of the solubilizer to the oil-soluble viscosity reducer is (2-8):1, wherein the solubilizer is a p-methyl benzoate compound and theoil-soluble viscosity reducer is a long-chain acrylic ester-vinyl acetate-acrylamide copolymer. The oil displacement additive provided by the invention can be mutually dissolved with a CO2 fluid; through the change of the thermodynamic property of the CO2 fluid, the ability of CO2 of dissolving into crude oil is enhanced, so that mixed-phase displacement can be promoted. In addition, the oil displacing agent can be further carried by CO2 to the contact part with the crude oil, and is dissolved in the crude oil, so that the micellar structure formed by stacking and accumulation of asphaltene-colloid in the crude oil is destroyed, a viscosity reduction effect is achieved, and the fluidity of crude oil is enhanced. The oil displacement additive is especially suitable for high-viscosity and low-permeability heavy oil reservoirs and has a wide application prospect.

Description

technical field [0001] The present invention relates to an enhanced CO 2 An oil displacement additive that is miscible with crude oil and reduces the viscosity of crude oil, in CO 2 enhanced oil recovery (CO 2 -EOR) process, can simultaneously enhance CO 2 It is miscible with crude oil and reduces the viscosity of crude oil, thereby enhancing the recovery of crude oil, which belongs to the technical field of oil field development. Background technique [0002] Oil extraction can generally be divided into three stages. Primary oil recovery is to use the natural energy of the formation to drive crude oil, and the recovery rate is generally 5% to 20%. Secondary oil recovery is to inject water or gas by maintaining the energy of the formation. 30% to 40% of crude oil reserves can be recovered, but 60% to 70% of crude oil remains underground. Therefore, the research and application of new technologies for tertiary oil recovery have great economic and academic value. Tertiary ...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/82C08F220/56C08F218/08C08F220/18
CPCC09K8/594C09K8/82C08F220/56C08F218/08C08F220/1818C08F220/1812
Inventor 孙业恒许坚吴光焕王胜邓宏伟孙宝泉张以根张礼臻王一平贾丽华李伟张民
Owner CHINA PETROLEUM & CHEM CORP
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